D 27. The rate of diffusion through a selectively permeable membrane will be lowest when which of the following is(are) true?
I. Concentration gradients are steep.
II. Temperatures are low.
III. Solutes are small molecules.
a. I only
b. II only
c. I and III
d. II and III
e. I, II, and III
Answer: b
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Auxotrophs are organisms that can grow
A) on minimal media. B) on complete media. C) only on amino acid supplemented media. D) only on vitamin supplemented media. E) on any media.
An organism with a nucleus would be placed in which domain?
A) Archaea B) Animalia C) Fungi D) Eukarya E) Bacteria
When certain molecules are pumped across biological membranes against a concentration gradient via active transport, ATP is used
In the cells of our bodies, for example, sugars are actively transported and metabolized within the membrane-enclosed mitochondria. Prokaryotes, in contrast, lack mitochondria but are nonetheless able to metabolize the same sugars. Based on the details provided in this scenario, which of the following statements is expected to be TRUE? A) Overall, prokaryotes will gain more ATP per sugar molecule metabolized than will eukaryotes. B) Sugar metabolism in prokaryotes is exergonic, whereas in eukaryotes it is endergonic. C) The sugar-digesting enzymes in eukaryotic cells, such as sucrase, are not the same sugar-digesting enzymes found in prokaryotic cells. D) Prokaryotes and eukaryotes should have the same metabolic efficiency when digesting the same sugars, assuming their enzymes are the same.
Which statement best compares aerobic and anaerobic respiration?
a) less atp is generated during anaerobic than during aerobic b) more water is generated during anaerobic than during aerobic c) more O2 is generated during anaerobic than during aerobic